const electron = require('electron');
const puppeteer = require('puppeteer');

// Module to control application life.
const app = electron.app;
// Module to create native browser window.
const BrowserWindow = electron.BrowserWindow;

const path = require('path');
const url = require('url');

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow;

async function getPic(url) {
  const browser = await puppeteer.launch({ headless: true, slowMo: 250 });
  const page = await browser.newPage();
  await page.goto(url);
  await page.setViewport({ width: 1200, height: 800 });
  await page.screenshot({ path: 'google.png' });

  await browser.close();
}

function createWindow() {
  // Create the browser window.
  mainWindow = new BrowserWindow({ width: 400, height: 600, webPreferences:{ nodeIntegration: true } });

  // and load the index.html of the app.
  mainWindow.loadURL(
    url.format({
      pathname: path.join(__dirname, 'index.html'),
      protocol: 'file:',
      slashes: true
    })
  );

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()

  // Emitted when the window is closed.
  mainWindow.on('closed', function() {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null;
  });

  // getPic('https://www.baidu.com')
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow);

// Quit when all windows are closed.
app.on('window-all-closed', function() {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
    app.quit();
  }
});

app.on('activate', function() {
  // On OS X it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (mainWindow === null) {
    createWindow();
  }
});

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.
